Abstract: An electronic ballast circuit (FIG. 1) includes a voltage-regulated DC power source and an H-bridge having a plurality of transistors (Q5, Q6, Q7, Q8). The circuit operates a high intensity discharge lamp (50). A regulating circuit electrically connected to the transistors regulates the peak current flowing through the H-bridge by discharging a parasitic capacitance (C parasitic).

Abstract: Semiconductor chip which emits electromagnetic radiation, and method for fabricating it. To improve the light yield of semiconductor chips which emit electromagnetic radiation, a textured reflection surface (131) is integrated on the p-side of a semiconductor chip. The semiconductor chip has an epitaxially produced semiconductor layer stack (1) based on GaN, which comprises an n-conducting semiconductor layer (11), a p-conducting semiconductor layer (13) and an electromagnetic radiation generating region (12) which is arranged between these two semiconductor layers (11, 13). The surface of the p-conducting semiconductor layer (13) which faces away from the radiation-generating region (12) is provided with three-dimensional pyramid-like structures (15). A mirror layer (40) is arranged over the whole of this textured surface. A textured reflection surface (131) is formed between the mirror layer (40) and the p-conducting semiconductor layer (13).

Abstract: A self-ballasted fluorescent lamp (10) that comprises a housing (12) formed to contain a ballast. The housing (12) has a top surface (14) with openings (16) leading from the exterior of the housing (12) to the interior. The openings (16) can be in the form of raised bosses having upstanding walls (16a). A restricted portion (18), which can take the form of a flange, is formed with the opening (16) and a safe end-of-life enabling device (20) is positioned in the opening (16) and in contact with the restricted portion (18). The safe end-of-life device (20) is tubular, has low thermal conductivity and in preferred forms of the invention is a glass such as quartz or a ceramic such as aluminum oxide. The ends (22) of a fluorescent lamp (24) penetrate the tubular end-of-life device (20) and extend into the interior of the housing for suitable connection to an enclosed electronic ballast. A retainer (26) is positioned opposite the restricted portion for maintaining the end-of-life device within the opening.

Abstract: The light source has an LED, preferably produced for the surface-mounting technique, embedded in a transparent material filling. A converter substance is integrated in the filling for the at least partial wavelength conversion of the light emitted by the LED. A lens is glued onto the transparent material filling. The material filling has a convex surface and the lens has a concave underside entering into a form fit with the convex surface of the material filling.

Abstract: A driver circuit for an active matrix display is disclosed wherein said driver circuit comprises a first transistor, said first transistor comprising a source, a drain and a gate; a storage capacitor, said storage capacitor comprising a terminal, said terminal connected to one line, said one line comprised of a group of said source and said drain of said first transistor; a second transistor, said second transistor comprising a source, a drain and gate, wherein said gate is connected to said terminal of said storage transistor; wherein said drain and said source of said second transistor are connected to one of group, said group comprising a power source and a pixel element respectively; and further wherein storage capacitor is chargeable to sufficiently high voltage to operate said second transistor in its linear region of operation.

Abstract: Method for introducing a limited amount of mercury into a fluorescent lamp during manufacture thereof includes the steps of forming the lamp with an exhaust tubulation therein open at an end thereof and provided with a ball retention structure, exhausting the interior of the lamp through the tubulation open end, placing a rigid ball of inert material in the tubulation between the ball retention structure and the tubulation open end, the ball having a coating of a selected one of silver, gold, and indium, of a selected mass over a selected surface area of the ball, and mercury on the coated area, and sealing the open end of the tubulation, whereby the amount of mercury retained on the ball and thereby introduced into the lamp is limited by the selected mass of the coating on the ball.

Abstract: A housing accommodating a semiconductor chip is set out. The housing and chip may be used for sending and/or receiving radiation. Popular applications of the housing may be in light emitting diodes. The housing includes a conductor strip that is punched into two electrically isolated portions. The housing further includes a cavity extending inwards from the top of the housing. The conductor portions include respective areas that are exposed at the bottom of the cavity. The semiconductor chip is bonded to one of the exposed areas and a wire bonds the chip to the second exposed area. The conductor portions also terminate in exposed electrodes, which allow for electrical connection of the chip with external devices. A window is formed in the cavity and the walls of the housing that form the cavity may be made of a reflective material. The electrodes remain unexposed to the window but for any residual areas about the chip and bonding wire within the first and second exposed areas.

Abstract: The discharge lamp lighting apparatus has a step-up/step-down converter 3 comprising a transformer 3a, a first switching element 3b serially connected to the transformer 3a on a side of a commercial ac power source 1, and a first diode 3c and a first capacitor 3d connected to the transformer 3a on the load side; zero-cross detection means 10 for detecting the zero-cross of voltage of the commercial ac power source 1; a supplemental power circuit 4 comprising a second diode 4a connected to the junction between the transformer 3a and the first switching element 3b, a second capacitor 4c for charging electric power stored in the coil of the transformer 3a on a side of the commercial ac power source 1 via the second diode 4a, and a second switching element 4b, a third diode 4f and an inductance 4e through which the energy charged in the second capacitor 4c is supplied to the discharge lamp 8; and a control circuit 9 that operates the second switching element 4b in the supplemental power means 4 based on the outpu

Abstract: An embodiment of the present invention pertains to an organic electronic device that uses a colored substrate to change an emission spectrum of light passing through the colored substrate. The colored substrate changes the emission spectrum of light passing through it by absorbing light at a portion of the wavelengths, or by absorbing light at a portion of the wavelengths and by reemitting a portion of the absorbed light at different wavelengths. The colored substrate is commercially available.

Abstract: A method for inhibiting the leaching of mercury from a mercury vapor discharge lamp wherein at least a part of the mercury is present as ionic mercury includes depositing a coating of SnO2 on an interior surface of the lamp envelope. The SnO2 coating is substantially free of a substance which would cause electrical conductivity of the coating. Further included within the lamp is a quantity of oxidizable iron in an amount equal to at least 1 gram per kilogram of lamp weight.

Abstract: A lamp assembly that comprises a hollow arc discharge light source having a center arc chamber containing an arc generating and sustaining medium and first and second ends with an electrode receiving capillary extending from each end and arrayed along a longitudinal axis. The ends are cylindrical in cross-section. An electrode structure is positioned in each of the capillaries and each of these electrode structures comprises a proximal electrode end projecting into the interior of the center arc chamber, a distal end projecting exteriorly of said capillary and an intermediate section therebetween. A first area of the intermediate section is sealed to the capillary in an hermetic manner and a second area of the intermediate section is exposed to the medium. A tubular shroud surrounds the light source and is coaxial with the longitudinal axis. The shroud has two ends. A pair of spring clips, one at each end of said shroud, mount the light source within the shroud.

Abstract: A ballast (100) having an inverter (110,120,122) and a direct current blocking capacitor (130) coupled in series with a ballast output (108) includes a control circuit (140) for providing adaptive end-of-lamp-life protection. During operation, control circuit executes the steps of measuring (208) and storing (210) a reference value for the voltage across the DC blocking capacitor (130), monitoring (308,310) the voltage across the DC blocking capacitor (130), and protecting (312) the inverter and lamp sockets in response to the voltage across the DC blocking capacitor departing from the reference value by more than a predetermined threshold amount.

Abstract: An embodiment of the present invention pertains to an electronic device such as a passive matrix display, an alpha-numeric display, a detector array, or a solar cell array. The electronic device includes multiple organic optoelectronic devices and one or more of these organic optoelectronic devices are protected from shorts. Each of the one or more organic optoelectronic devices that is protected from a short has one of its electrodes coupled to a first current limiting device and optionally has another electrode coupled to a second current limiting device. Also, one of the electrodes of that organic optoelectronic device, the first current limiting device, or the second current limiting device is patterned.

Abstract: A connecting pin (10) for an anode contact (11) (shown more completely in FIG. 2). The pin (10) has a body (12) with a longitudinal axis (14). A contact head (16) is formed at a proximal portion of the body (12) and a base (18) is formed at a distal portion of body (12). An intermediate shank (20) connects the head (16) and the base (18). The head (16), base (18) and intermediate shank (20) are all symmetrically arrayed about the longitudinal axis (14). The shank (20) has a first diameter (D,) and the contact head (16) has at least one lateral dimension (D2) that is greater than the shank diameter (D). The base (18) has a diameter (D3) that is greater than the shank diameter (D) and has a surface (22) that is planar and substantially orthogonal to the longitudinal axis (14).

Abstract: A high-surface-area heterogenite (HCoO2) material is described for use in making submicron cobalt metal powders. The HCoO2 material has a surface area of at least about 90 M2/g and is preferably produced by dehydrating a cobalt hydroxide precipitate at 110° C.

Abstract: A spring clip (10) has a base (12) in a first plane and has an aperture (14) centrally located therein. U-shaped projections (16) and (18) are provided on the base (12) and are formed from first and second upstanding walls (200 and (22) and third and fourth walls (24) and (26), at each end of the base (12). A first lip (28) extends orthogonally between the first wall and second wall in a second plane and a second lip (29) extends orthogonally between the third wall and fourth wall, also in the second plane. The second plane is substantially parallel to the first plane but spaced therefrom. Extensions (30) and (32) are formed with the first wall and the third wall and project away from them. The extension are in substantially the same plane as base (12) and at least one flag (34) can be formed with at least one of the extensions. The flags (34) project away from the extensions (32) in a plane transverse to the first and second planes and allow the clips to be attached to a frame.

Abstract: A barrier stack for sealing devices is described. The barrier stack includes at least first and second base layers bonded together with a high barrier adhesive. A base layer includes a flexible support coated on at least one major surface with a barrier layer. The adhesive advantageously seals defects, such as pinholes in the barrier layer, thus improving the barrier properties.

Abstract: A photoresist layer (3) on the surface (2) of a substrate (1) is covered with a metalization layer (7) for the purpose of heating, so that an etching-stable photoresist layer with sharp structures is available after heating.

Abstract: An optoelectronic component having a basic housing or frame (12) and at least one semiconductor chip (20), specifically a radiation-emitting or -receiving semiconductor chip, in a cavity (18) of the basic housing. In order to increase the efficiency of the optoelectronic component (10), reflectors are provided in the cavity in the region around the semiconductor chip. These reflectors are formed by virtue of the fact that a filling compound (28) filled at least partly into the cavity (18) is provided, the material and the quantity of the filling compound (28) being chosen in such a way that the filling compound, on account of the adhesion force between the filling compound and the basic housing, assumes a form which widens essentially conically from bottom to top in the cavity, and the conical inner areas (30) of the filling compound serve as reflector.

Abstract: The organic electroluminescent component of the invention has a transparent bottom electrode situated on a substrate; a top electrode composed of a metal that is inert to oxygen and moisture; at least one organic function layer arranged between the bottom electrode and the top electrode; and a charge carrier injection layer containing a complex metal salt of the composition (Me1)(Me2) Fm+n, whereby the following applies: m and n are respectively a whole number corresponding to the valence of the metals Me1 and Me2 (the metal Me1 thereby has the valence m, the metal Me2 the valence n), Me1 is selected from a group consisting of Li, Na, K, Mg and Ca, Me2 is selected from a group consisting of Mg, Al, Ca, Zn, Ag, Sb, Ba, Sm and Yb, with the prescription: Me1≠Me2.